Things still to be done:

- Correcting ioctl's for changing block replication count so that it
checks that it is not leaving no valid copies.
- Memory mapping.
- Load encryption modules separately so that they do not need to all be
compiled in together. (or maybe offer a choice in the kernel config?)
- fsck.stegfs tool.
- tidy up endianness and word size issues
- make stegfs_i and stegfs_sb structures smaller. (hang data off them).

Possible thoughts:
- Auto-create roots?

